C.R.S. § 18-18-504

(1) It is not necessary for the state to negate any exemption or exception in this article in any complaint, information, indictment, or other pleading or in any trial, hearing, or other proceeding under this article. (2) No person is presumed to be the holder of an appropriate registration or order form issued under this article. (3) No civil or criminal liability is imposed by this article upon any authorized state, county, or municipal officer, engaged in the lawful administration or enforcement of this article.